Marx mccomas



M. MCOMA$ DRIFTING VALVE March 1, 1932.

Filed July 26, '1926 r I Gite-(Maw),

Patented Mar. 1, 1932 UNITED STATES MARK MCGOMAS, or DENISON, TEXAS, Assrenon, Brian-sun ASSIGNMENTS, or

ONE-HALF T 0. E. sTAN'romos DALLAS, Taxes Y Application filed July as,

This invention relates to a device especially designed for use in connection with locosuch a. way that steammay be storedin the motives, the primary object of the invention being to provide means for directing a quantity of steam to the valves, dry pipe and movable parts of a locomotive to cushion the movable parts while the engine is working or drifting.

A still further object of the invention is to providemeans for supplying steam to the cylinders and valve chambers at all times, to V maintain the proper temperature within the cylinders and valve chambers to reduce condensation tothe minimum. 7 V a V 'A further object of the invention is to provide a device of this character whichwill be automatic in its operationand one which will not function when the locomotive is running at low rates of speed, or is brought to a stop.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that changes in the precise embodiment of the a device constructed in accordance with the invention as installed on a locomotive.

Figure 2 is a view illustrating the device on an enlarged scale, the valve members thereof being shown in section.

Figure 3 is an enlarged sectional view- 1 steam from the storage tank when the engine and the reference character 6 indicates v a" valve chamber for controlling the passage of seen that when the engine 1s running,- steam '95 inder 5 as-shown by Figure 1. This pipe 7 is connected with the pipe 8 in whichthe.

192e. Serial No. 125,614.

tank 10 and will be prevented fromreturn; ing to the cylinder 5. g I

.Pipe :11 communicates with oneendof the storage tank 10 and is connected with pipe'12- by means of the elbow 13, which pipe l2connects with the substantially short pipe 14 which in turn, communicates with the interior' of the valve housing 15o. This valve housing 15. is supported *by means of the bracket 16 which is secured to the boiler case ing 17 ofxthelocomotive, and as shown, vis

suppliedwith a removable head 18 havinga depression. forming aseat for one .end'of the coiled spring 19;

Operatingwithin the valve-housing isxa piston 20 which is normally urged to the limit of its forward movement by means .of the coiled spring 19, which, is shown as bearing against the piston 20. o I

The reference character 21 indicates the" piston rod which extends through one end of the valve housing and connects with the piston 20, the rod 21 also passing throughthe bonnet 22 and steam dome, as clearly dome through drifting valve into throttle box, where it may find its way into the valvechamber and cylinders of the locomotive.

' The storage tank is. supplied with an ex: haust opening 26 which is adapted to exhaust o is running at a low rate of speed, or is stopped, to relieve the'pressure within the storage tank and allow the spring 19 to act on the piston r 20 to close the valve 23. I o e In the operation of the device it will .be

will pass through the pipes leading from the cylinder 5 to the storage tank where the steam will collect, the pressure of the steam acting? the spring 19 As the spring 19 is compressed by the rear- Ward movement of the piston 20, valve 23 Will be moved to its open position to allow steam to pass to the valve chamber and cylinder cushioning the moving parts.

When the engine is drifting, sufiicient compression is developed in the front end of the steam cylinder to act on the piston 20 to unseat the valve 23, allowing steam from the boiler to pass into the dry pipe and hence I into the valves and cylinders of the locomotive furnishing steam to maintain the proper temperature in the cylinders and Valvechambers at all times.

I claim; I Ail-auxiliary valve for automatically releasing steam from the throttle box to the cylinders of a locomotive, comprising a valve body mounted Within the throttle box and communicating With the interior thereof, a valve operating in the valve body to normally close the valve body, arod to Which the valve is connected,'a piston on one end of the rod, a housing in Whiclrthe piston operates, a spring in the housing for normally urging the piston in onev direction to seatthe valve, a pipe extending from one end of an engine cylinder and communicating with the valve housing, and a storage tank in the pipe line for automatically storing up steam to operate the piston and valve againstthetension ofthe spring to direct a quantity of steam to the valves of the engine. o

In testimony that I claim theforegoin'g as my oWn, I have heretoaflixed my signature. MARK MoCOMAS. 

